<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="iphone.css" >
  <style>
    html, body {
      background-color: #000;
    }
    .volume-indicator {
      position: fixed;
      top: 10%;
      left: 20px;
    }
  </style>
</head>
<body>

  <div id="indicator" class="volume-indicator">
    <div class="volume-indicator__inner"></div>
  </div>
  
  <script src="volume-indicator.js"></script>
  <script>
    var Indicator = new VolumeIndicator(document.querySelector('#indicator'))
    console.log(Indicator)
  </script>

</body>
</html>